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<h1 class='mb-8'>Event Handling</h1>

<div class='border-t'><p>We extend vue to support the following types of event handling, so you can simply use go code to implement some complex logic.</p>

<p>Using the <code>Plaid()</code> method will create an event handler that defaults to using the current <code>vars</code> and <code>plaidForm</code>.
The default http request method is <code>Post</code>, if you want to use the <code>Get</code> method, you can also use the <code>Get()</code> method directly to create an event handler</p>

<h2 id='url'>URL
<a href='#url' class='anchor'></a>
</h2>
<p>Request a page.</p>

<highlightjs :language='"go"' :code='"func EventHandlingURL(ctx *web.EventContext) (pr web.PageResponse, err error) {\n\tpr.Body = Div(\n\t\tDiv(\n\t\t\tH2(\"URL\"),\n\t\t\tButton(\"Go\").Attr(\"@click\", web.GET().URL(EventExamplePagePath).Go()),\n\t\t),\n\t)\n\treturn\n}\n"'></highlightjs>

<div>
<div class='demo'>
<a href='/examples/event-handling-page?api=url' target='_blank'>Check the demo</a>
 | 
<a href='https://github.com/qor5/admin/tree/main/docs/docsrc/../../../../../go/pkg/mod/github.com/qor5/web/v3@v3.0.12-0.20250225073451-8e876be98c21/examples/event-handling.go#L12-L23' target='_blank'>Source on GitHub</a>
</div>
</div>

<h2 id='pushstate'>PushState
<a href='#pushstate' class='anchor'></a>
</h2>
<p>Reqest a page and also changing the window location.</p>

<highlightjs :language='"go"' :code='"func EventHandlingPushState(ctx *web.EventContext) (pr web.PageResponse, err error) {\n\tpr.Body = Div(\n\t\tH2(\"PushState\"),\n\n\t\tButton(\"Go\").Attr(\"@click\", web.GET().\n\t\t\tURL(EventExamplePagePath).\n\t\t\tPushState(true).\n\t\t\tGo()),\n\t)\n\treturn\n}\n"'></highlightjs>

<div>
<div class='demo'>
<a href='/examples/event-handling-page?api=pushstate' target='_blank'>Check the demo</a>
 | 
<a href='https://github.com/qor5/admin/tree/main/docs/docsrc/../../../../../go/pkg/mod/github.com/qor5/web/v3@v3.0.12-0.20250225073451-8e876be98c21/examples/event-handling.go#L25-L38' target='_blank'>Source on GitHub</a>
</div>
</div>

<h2 id='reload'>Reload
<a href='#reload' class='anchor'></a>
</h2>
<p>Refresh page.</p>

<highlightjs :language='"go"' :code='"func EventHandlingReload(ctx *web.EventContext) (pr web.PageResponse, err error) {\n\tpr.Body = Div(\n\t\tH2(\"Reload\"),\n\t\tText(fmt.Sprintf(\"Now: %s\", time.Now().Format(time.RFC3339Nano))),\n\t\tButton(\"Reload\").Attr(\"@click\", web.POST().Reload().Go()),\n\t)\n\treturn\n}\n"'></highlightjs>

<div>
<div class='demo'>
<a href='/examples/event-handling-page?api=reload' target='_blank'>Check the demo</a>
 | 
<a href='https://github.com/qor5/admin/tree/main/docs/docsrc/../../../../../go/pkg/mod/github.com/qor5/web/v3@v3.0.12-0.20250225073451-8e876be98c21/examples/event-handling.go#L40-L50' target='_blank'>Source on GitHub</a>
</div>
</div>

<h2 id='query'>Query
<a href='#query' class='anchor'></a>
</h2>
<p>Request a page with a query.</p>

<highlightjs :language='"go"' :code='"func EventHandlingQuery(ctx *web.EventContext) (pr web.PageResponse, err error) {\n\tpr.Body = Div(\n\t\tH2(\"Query\"),\n\t\tButton(\"Go\").Attr(\"@click\", web.GET().URL(EventExamplePagePath).PushState(true).Query(\"address\", \"tokyo\").Go()),\n\t)\n\n\treturn\n}\n"'></highlightjs>

<div>
<div class='demo'>
<a href='/examples/event-handling-page?api=query' target='_blank'>Check the demo</a>
 | 
<a href='https://github.com/qor5/admin/tree/main/docs/docsrc/../../../../../go/pkg/mod/github.com/qor5/web/v3@v3.0.12-0.20250225073451-8e876be98c21/examples/event-handling.go#L52-L62' target='_blank'>Source on GitHub</a>
</div>
</div>

<h2 id='mergequery'>MergeQuery
<a href='#mergequery' class='anchor'></a>
</h2>
<p>Request a page with merging a query.</p>

<highlightjs :language='"go"' :code='"func EventHandlingMergeQuery(ctx *web.EventContext) (pr web.PageResponse, err error) {\n\tpr.Body = Div(\n\t\tH2(\"MergeQuery\"),\n\n\t\tButton(\"Go\").Attr(\"@click\", web.GET().URL(EventExamplePagePath+\"?address=beijing\u0026name=qor5\u0026email=qor5@theplant.jp\").PushState(true).Query(\"address\", \"tokyo\").MergeQuery(true).Go()),\n\t)\n\treturn\n}\n"'></highlightjs>

<div>
<div class='demo'>
<a href='/examples/event-handling-page?api=merge_query' target='_blank'>Check the demo</a>
 | 
<a href='https://github.com/qor5/admin/tree/main/docs/docsrc/../../../../../go/pkg/mod/github.com/qor5/web/v3@v3.0.12-0.20250225073451-8e876be98c21/examples/event-handling.go#L64-L74' target='_blank'>Source on GitHub</a>
</div>
</div>

<h2 id='clearmergequery'>ClearMergeQuery
<a href='#clearmergequery' class='anchor'></a>
</h2>
<p>Request a page with clearing a query.</p>

<highlightjs :language='"go"' :code='"func EventHandlingClearMergeQueryQuery(ctx *web.EventContext) (pr web.PageResponse, err error) {\n\tpr.Body = Div(\n\t\tH2(\"ClearMergeQuery\"),\n\n\t\tButton(\"Go\").Attr(\"@click\", web.GET().\n\t\t\tURL(EventExamplePagePath+\"?address=beijing\u0026name=qor5\u0026email=qor5@theplant.jp\").\n\t\t\tPushState(true).\n\t\t\tQuery(\"address\", \"tokyo\").\n\t\t\tClearMergeQuery([]string{\"name\"}).\n\t\t\tGo()),\n\t)\n\treturn\n}\n"'></highlightjs>

<div>
<div class='demo'>
<a href='/examples/event-handling-page?api=clear_merge_query' target='_blank'>Check the demo</a>
 | 
<a href='https://github.com/qor5/admin/tree/main/docs/docsrc/../../../../../go/pkg/mod/github.com/qor5/web/v3@v3.0.12-0.20250225073451-8e876be98c21/examples/event-handling.go#L76-L91' target='_blank'>Source on GitHub</a>
</div>
</div>

<h2 id='stringquery'>StringQuery
<a href='#stringquery' class='anchor'></a>
</h2>
<p>Request a page with a query string.</p>

<highlightjs :language='"go"' :code='"func EventHandlingStringQuery(ctx *web.EventContext) (pr web.PageResponse, err error) {\n\tpr.Body = Div(\n\t\tH2(\"StringQuery\"),\n\n\t\tButton(\"Go\").Attr(\"@click\", web.GET().\n\t\t\tURL(EventExamplePagePath).\n\t\t\tPushState(true).\n\t\t\tStringQuery(\"address=tokyo\").\n\t\t\tGo()),\n\t)\n\treturn\n}\n"'></highlightjs>

<div>
<div class='demo'>
<a href='/examples/event-handling-page?api=string_query' target='_blank'>Check the demo</a>
 | 
<a href='https://github.com/qor5/admin/tree/main/docs/docsrc/../../../../../go/pkg/mod/github.com/qor5/web/v3@v3.0.12-0.20250225073451-8e876be98c21/examples/event-handling.go#L93-L107' target='_blank'>Source on GitHub</a>
</div>
</div>

<h2 id='queries'>Queries
<a href='#queries' class='anchor'></a>
</h2>
<p>Request a page with url.Values.</p>

<highlightjs :language='"go"' :code='"func EventHandlingQueries(ctx *web.EventContext) (pr web.PageResponse, err error) {\n\tpr.Body = Div(\n\t\tH2(\"Queries\"),\n\n\t\tButton(\"Go\").Attr(\"@click\", web.GET().\n\t\t\tURL(EventExamplePagePath).\n\t\t\tPushState(true).\n\t\t\tQueries(url.Values{\"address\": []string{\"tokyo\"}}).\n\t\t\tGo()),\n\t)\n\treturn\n}\n"'></highlightjs>

<div>
<div class='demo'>
<a href='/examples/event-handling-page?api=queries' target='_blank'>Check the demo</a>
 | 
<a href='https://github.com/qor5/admin/tree/main/docs/docsrc/../../../../../go/pkg/mod/github.com/qor5/web/v3@v3.0.12-0.20250225073451-8e876be98c21/examples/event-handling.go#L109-L123' target='_blank'>Source on GitHub</a>
</div>
</div>

<h2 id='pushstateurl'>PushStateURL
<a href='#pushstateurl' class='anchor'></a>
</h2>
<p>Request a page with a url and also changing the window location.</p>

<highlightjs :language='"go"' :code='"func EventHandlingQueries(ctx *web.EventContext) (pr web.PageResponse, err error) {\n\tpr.Body = Div(\n\t\tH2(\"Queries\"),\n\n\t\tButton(\"Go\").Attr(\"@click\", web.GET().\n\t\t\tURL(EventExamplePagePath).\n\t\t\tPushState(true).\n\t\t\tQueries(url.Values{\"address\": []string{\"tokyo\"}}).\n\t\t\tGo()),\n\t)\n\treturn\n}\n"'></highlightjs>

<div>
<div class='demo'>
<a href='/examples/event-handling-page?api=pushstateurl' target='_blank'>Check the demo</a>
 | 
<a href='https://github.com/qor5/admin/tree/main/docs/docsrc/../../../../../go/pkg/mod/github.com/qor5/web/v3@v3.0.12-0.20250225073451-8e876be98c21/examples/event-handling.go#L109-L123' target='_blank'>Source on GitHub</a>
</div>
</div>

<h2 id='location'>Location
<a href='#location' class='anchor'></a>
</h2>
<p>Open a page with more options.</p>

<highlightjs :language='"go"' :code='"func EventHandlingLocation(ctx *web.EventContext) (pr web.PageResponse, err error) {\n\tpr.Body = Div(\n\t\tH2(\"Location\"),\n\n\t\tButton(\"Go\").Attr(\"@click\", web.POST().\n\t\t\tPushState(true).\n\t\t\tLocation(\u0026web.LocationBuilder{MyURL: EventExamplePagePath, MyStringQuery: \"address=test\"}).\n\t\t\tGo()),\n\t)\n\treturn\n}\n"'></highlightjs>

<div>
<div class='demo'>
<a href='/examples/event-handling-page?api=location' target='_blank'>Check the demo</a>
 | 
<a href='https://github.com/qor5/admin/tree/main/docs/docsrc/../../../../../go/pkg/mod/github.com/qor5/web/v3@v3.0.12-0.20250225073451-8e876be98c21/examples/event-handling.go#L139-L152' target='_blank'>Source on GitHub</a>
</div>
</div>

<h2 id='fieldvalue'>FieldValue
<a href='#fieldvalue' class='anchor'></a>
</h2>
<p>Fill in a value on form.</p>

<highlightjs :language='"go"' :code='"func EventHandlingFieldValue(ctx *web.EventContext) (pr web.PageResponse, err error) {\n\tpr.Body = Div(\n\t\tH2(\"FieldValue\"),\n\n\t\tButton(\"Go\").Attr(\"@click\", web.POST().\n\t\t\tEventFunc(\"form\").\n\t\t\tFieldValue(\"name\", \"qor5\").\n\t\t\tGo()),\n\t)\n\treturn\n}\n"'></highlightjs>

<div>
<div class='demo'>
<a href='/examples/event-handling-page?api=fieldvalue' target='_blank'>Check the demo</a>
 | 
<a href='https://github.com/qor5/admin/tree/main/docs/docsrc/../../../../../go/pkg/mod/github.com/qor5/web/v3@v3.0.12-0.20250225073451-8e876be98c21/examples/event-handling.go#L154-L167' target='_blank'>Source on GitHub</a>
</div>
</div>

<h2 id='eventfunc'>EventFunc
<a href='#eventfunc' class='anchor'></a>
</h2>
<p>Register an event func and call it when the event is triggered.</p>

<highlightjs :language='"go"' :code='"func EventHandlingEventFunc(ctx *web.EventContext) (pr web.PageResponse, err error) {\n\tpr.Body = Div(\n\t\tH2(\"EventFunc\"),\n\t\tButton(\"Go\").Attr(\"@click\", web.POST().\n\t\t\tEventFunc(\"hello\").\n\t\t\tGo()),\n\t)\n\treturn\n}\n"'></highlightjs>

<div>
<div class='demo'>
<a href='/examples/event-handling-page?api=eventfunc' target='_blank'>Check the demo</a>
 | 
<a href='https://github.com/qor5/admin/tree/main/docs/docsrc/../../../../../go/pkg/mod/github.com/qor5/web/v3@v3.0.12-0.20250225073451-8e876be98c21/examples/event-handling.go#L169-L180' target='_blank'>Source on GitHub</a>
</div>
</div>

<h2 id='script'>Script
<a href='#script' class='anchor'></a>
</h2>
<p>Run a script code.</p>

<highlightjs :language='"go"' :code='"func EventHandlingScript(ctx *web.EventContext) (pr web.PageResponse, err error) {\n\taddMessageScript := func(msg string) string {\n\t\treturn fmt.Sprintf(`vars.messages ||= []; vars.messages.push(%q)`, msg)\n\t}\n\tpr.Body = Div(\n\t\tH2(\"Script\"),\n\n\t\tButton(\"Go\").Attr(\"@click\",\n\t\t\tweb.POST().\n\t\t\t\tBeforeScript(addMessageScript(\"this is before script\")).\n\t\t\t\tAfterScript(addMessageScript(\"this is after script\")).\n\t\t\t\tThenScript(addMessageScript(\"this is then script\")).\n\t\t\t\tGo(),\n\t\t),\n\t\tDiv().Text(`{{ vars.messages }}`),\n\t)\n\treturn\n}\n"'></highlightjs>

<div>
<div class='demo'>
<a href='/examples/event-handling-page?api=script' target='_blank'>Check the demo</a>
 | 
<a href='https://github.com/qor5/admin/tree/main/docs/docsrc/../../../../../go/pkg/mod/github.com/qor5/web/v3@v3.0.12-0.20250225073451-8e876be98c21/examples/event-handling.go#L182-L202' target='_blank'>Source on GitHub</a>
</div>
</div>

<h2 id='raw'>Raw
<a href='#raw' class='anchor'></a>
</h2>
<p>Directly call the js method</p>

<highlightjs :language='"go"' :code='"func EventHandlingRaw(ctx *web.EventContext) (pr web.PageResponse, err error) {\n\tpr.Body = Div(\n\t\tH2(\"Raw\"),\n\t\tButton(\"Go\").Attr(\"@click\", web.POST().\n\t\t\tRaw(`pushStateURL(\"/samples/event_handling/example\")`).\n\t\t\tGo()),\n\t)\n\treturn\n}\n"'></highlightjs>

<div>
<div class='demo'>
<a href='/examples/event-handling-page?api=raw' target='_blank'>Check the demo</a>
 | 
<a href='https://github.com/qor5/admin/tree/main/docs/docsrc/../../../../../go/pkg/mod/github.com/qor5/web/v3@v3.0.12-0.20250225073451-8e876be98c21/examples/event-handling.go#L204-L215' target='_blank'>Source on GitHub</a>
</div>
</div>
</div>
</div>
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